activity: Remove unnecessary scrollbar update of users.
activity: Remove unnecessary scrollbar update of users.

This call to update the users scrollbar is inside a huddles update
method which should only affect the group PMs, so we can remove the
update function.

jackrzhang/zulip,amanharitsh123/zulip,rht/zulip,andersk/zulip,rishig/zulip,Galexrt/zulip,jackrzhang/zulip,timabbott/zulip,zulip/zulip,mahim97/zulip,zulip/zulip,punchagan/zulip,brainwane/zulip,kou/zulip,brainwane/zulip,brockwhittaker/zulip,brainwane/zulip,kou/zulip,synicalsyntax/zulip,tommyip/zulip,hackerkid/zulip,rht/zulip,shubhamdhama/zulip,punchagan/zulip,showell/zulip,showell/zulip,shubhamdhama/zulip,zulip/zulip,andersk/zulip,brockwhittaker/zulip,showell/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,mahim97/zulip,rishig/zulip,brockwhittaker/zulip,tommyip/zulip,amanharitsh123/zulip,andersk/zulip,timabbott/zulip,andersk/zulip,andersk/zulip,brainwane/zulip,timabbott/zulip,brockwhittaker/zulip,amanharitsh123/zulip,synicalsyntax/zulip,Galexrt/zulip,brainwane/zulip,synicalsyntax/zulip,hackerkid/zulip,amanharitsh123/zulip,eeshangarg/zulip,kou/zulip,kou/zulip,rishig/zulip,timabbott/zulip,rishig/zulip,hackerkid/zulip,Galexrt/zulip,eeshangarg/zulip,shubhamdhama/zulip,dhcrzf/zulip,hackerkid/zulip,brockwhittaker/zulip,kou/zulip,rht/zulip,punchagan/zulip,tommyip/zulip,punchagan/zulip,synicalsyntax/zulip,dhcrzf/zulip,punchagan/zulip,brainwane/zulip,hackerkid/zulip,punchagan/zulip,Galexrt/zulip,dhcrzf/zulip,showell/zulip,Galexrt/zulip,zulip/zulip,showell/zulip,jackrzhang/zulip,tommyip/zulip,synicalsyntax/zulip,mahim97/zulip,hackerkid/zulip,eeshangarg/zulip,brockwhittaker/zulip,rht/zulip,amanharitsh123/zulip,dhcrzf/zulip,eeshangarg/zulip,tommyip/zulip,jackrzhang/zulip,showell/zulip,rishig/zulip,mahim97/zulip,showell/zulip,eeshangarg/zulip,rishig/zulip,hackerkid/zulip,dhcrzf/zulip,zulip/zulip,kou/zulip,shubhamdhama/zulip,mahim97/zulip,dhcrzf/zulip,eeshangarg/zulip,synicalsyntax/zulip,andersk/zulip,tommyip/zulip,shubhamdhama/zulip,kou/zulip,tommyip/zulip,Galexrt/zulip,mahim97/zulip,dhcrzf/zulip,timabbott/zulip,synicalsyntax/zulip,shubhamdhama/zulip,shubhamdhama/zulip,jackrzhang/zulip,jackrzhang/zulip,jackrzhang/zulip,amanharitsh123/zulip,timabbott/zulip,zulip/zulip,rishig/zulip,rht/zulip,andersk/zulip,punchagan/zulip,rht/zulip,Galexrt/zulip,brainwane/zulip,timabbott/zulip